20730855 has 8 divisors (see below), whose sum is σ = 33169392. Its totient is φ = 11056448.

The previous prime is 20730839. The next prime is 20730869. The reversal of 20730855 is 55803702.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20730855 - 2⁴ = 20730839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 691014 + ... + 691043.

It is an arithmetic number, because the mean of its divisors is an integer number (4146174).

Almost surely, 2^20730855 is an apocalyptic number.

20730855 is a deficient number, since it is larger than the sum of its proper divisors (12438537).

20730855 is a wasteful number, since it uses less digits than its factorization.

20730855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382065.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 20730855 is about 4553.1148678679. The cubic root of 20730855 is about 274.7086942855.

The spelling of 20730855 in words is "twenty million, seven hundred thirty thousand, eight hundred fifty-five".